Jonhnathan
95 lines
3.5 KiB
TOML
95 lines
3.5 KiB
TOML
[metadata]
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creation_date = "2025/09/25"
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integration = ["system", "windows"]
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maturity = "production"
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updated_date = "2025/11/14"
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[rule]
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author = ["Elastic"]
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description = """
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Identifies attempts to use the SeIncreaseBasePriorityPrivilege privilege by an unusual process. This could be related to
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hijack execution flow of a process via threats priority manipulation.
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"""
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from = "now-9m"
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index = ["logs-system.security*", "logs-windows.forwarded*", "winlogbeat-*"]
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language = "kuery"
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license = "Elastic License v2"
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name = "Suspicious SeIncreaseBasePriorityPrivilege Use"
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note = """## Triage and analysis
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### Investigating Suspicious SeIncreaseBasePriorityPrivilege Use
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SeIncreaseBasePriorityPrivilege allows to increase the priority of processes running on the system so that the CPU scheduler allows them to pre-empt other lower priority processes when the higher priority process has something to do.
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### Possible investigation steps
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- Review the process.executable reputation and it's execution chain.
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- Investiguate if the SubjectUserName is expected to perform this action.
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- Correlate the event with other security alerts or logs to identify any patterns or additional suspicious activities that might suggest a broader attack campaign.
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- Check the agent health status and verify if there is any tampering with endpoint security processes.
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### False positive analysis
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- Administrative tasks involving legitimate CPU scheduling priority changes.
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### Response and remediation
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- Immediately isolate the affected machine from the network to prevent further unauthorized access or lateral movement within the domain.
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- Terminate the processes involved in the execution chain.
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- Escalate the incident to the security operations center (SOC) or incident response team for further investigation and to ensure comprehensive remediation efforts are undertaken."""
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references = [
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"https://github.com/Octoberfest7/ThreadCPUAssignment_POC/tree/main",
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"https://x.com/sixtyvividtails/status/1970721197617717483",
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"https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-10/security/threat-protection/auditing/event-4674"
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]
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risk_score = 73
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rule_id = "6fa0f15b-1926-419b-8de2-fce1429797ba"
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setup = """## Setup
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Ensure advanced audit policies for Windows are enabled, specifically:
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Audit Sensitive Privilege Use [Event ID 4674](https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-10/security/threat-protection/auditing/event-4674) (An operation was attempted on a privileged object.)
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```
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Computer Configuration >
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Policies >
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Windows Settings >
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Security Settings >
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Advanced Audit Policies Configuration >
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Audit Policies >
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Privilege Use >
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Audit Sensitive Privilege Use (Success)
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```
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"""
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severity = "high"
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tags = [
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"Domain: Endpoint",
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"OS: Windows",
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"Use Case: Threat Detection",
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"Tactic: Privilege Escalation",
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"Data Source: Windows Security Event Logs",
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"Resources: Investigation Guide",
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]
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timestamp_override = "event.ingested"
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type = "query"
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query = '''
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event.category:iam and host.os.type:"windows" and event.code:"4674" and
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winlog.event_data.PrivilegeList:"SeIncreaseBasePriorityPrivilege" and event.outcome:"success" and
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winlog.event_data.AccessMask:"512" and not winlog.event_data.SubjectUserSid:("S-1-5-18" or "S-1-5-19" or "S-1-5-20")
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'''
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[[rule.threat]]
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framework = "MITRE ATT&CK"
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[[rule.threat.technique]]
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id = "T1134"
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name = "Access Token Manipulation"
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reference = "https://attack.mitre.org/techniques/T1134/"
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[rule.threat.tactic]
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id = "TA0004"
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name = "Privilege Escalation"
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reference = "https://attack.mitre.org/tactics/TA0004/"
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